Each mutation may contain multiple RDF triples. For large data uploads many such mutations can be batched in parallel. The command dgraph live does just this; by default batching 1000 RDF lines into a query, while running 100 such queries in parallel.
dgraph live takes as input gzipped N-Quad files (that is triple lists without { set {) and batches mutations for all triples in the input. The tool has documentation of options.
dgraph live --help
See also Fast Data Loading.
This is a companion discussion topic for the original entry at https://dgraph.io/docs/mutations/batch-mutations/